Stirrer



saris near mast ears WARREN 0. GHAGE, OF EVERETT, MASSACHUSETTS.

s'rmnnn.

Specification of Letters Patent. P te t d M 1 1922,

Application filed. August 18, 1920. Serial No. 40,290.

the accompanying drawings, is a specification, like characters on thedrawings representing like parts.

This invention relates to mixing machines or stirrers and its object isto provide a novel and more effective mixer than those in common use. I

In the drawings of the embodiment of my invention selected fordescription and illustration herein,

Fig. 1 is a partial vertical section;

Fig. 2, a plan the cross pieces 2 having been removed;

Fig. 3, a plan of the rotor of the mixer with the shaft in section, onthe line 33, Fig. 1; and

Fig. 4c, a side elevation of the rotor with the shaft broken off forconvenience.

Referring first to Figs. 1, 2, my novel stirrer comprises a tank 1, ofany suitable material, as wood.

The tank is provided with a cross piece 2, also of wood which acts as asupport and bearing for the rotor shaft 3, to be operated by anyconvenient means, not shown.

Within the tank are positioned baffle boards 4, herein also of wood, atthe proper height, usually just above the rotor paddles but for bestresults they should be at the liquid level. These boards may besupported in any convenient manner, as by cleats 5 on the inner tankwall, each board inner end engaging the face of an adjacent board nearthe center of the tank, the board end having tongues 6 which enterapertures such as mortises 6", in the face of the adjacent board endbeing held there by pins 6*.

The rotor, Figs. 3, t, comprises the shaft 3, and the paddles 7, 8,which are secured thereto in a novel manner. The shaft is slotted atright angles at the proper distance from the lower end to receive theshanks 9 of two long shank paddles 7, the shanks being crossed at theircenters by means of a conventional half joint.

Between these two long shank paddles are positioned pairs of short shankpaddles 8.

'To secure or lock these paddles firmly together and to the shaft 3, Ihave conceived a novel construction, one embodiment of which isillustrated. Each of the long shank paddles is provided on each sideface of the shank with a wedge-shaped section 9 having oppositelybevelled side faces 10, 11.

The outer end of the long shank 9 of each paddle 7 is tapered. outwardagain with a shoulder 12 on each side, and subsequently tapered outwardto the full width of the paddle blade 13. v

The short paddles 8 are bevelled inwardly from the blades 13 as at 15,one face being a straight bevel. The opposite face is provided with ashoulder 16 opposite to and cooperating with the shoulder 12 on theshank 90f the paddle 7. and receive between them two wedges 17, 18,whichare driven home tightly. I

In this manner all the paddle shanks act to lock each other firmly tothe shaft without any other locking devices or fasteners.

of any kind. Q

It will be noticed that the outer end of each paddle is bevelled, seeFig. 4, to provide a mixing or agitating blade 13 already referred to.

Mixers of this kind are especially designed to. thoroughly turn over,mix and quickly dissolve solids in light or heavy liquids. Suchapparatus is particularly desired by soap, color and paintmanufacturers, and oil refiners. It is also used generally by chemicalmanufacturers.

In these cases almost invariably such mixers must be of wood or somematerial that can safely be used without danger of being attacked by thechemicals. For this reason and for the above uses especially, I haveinvented the foregoing construction in which no metal or othervulnerable material need be used for any purpose.

In order to obtain a thorough and uniform mixing all the ingredientsmust be brought into constantly changing contact; each particle must bemade 'to' change its relative position and made to circulate through andnot with the mixture as a whole.

In mixers having a rotating arm in the horizontal or vertical planeonly, the contents of the tank are set in horizontal motion and aswirling effect is obtained, the whole mass gy-rating about the centeras a whole, but not giving the mass a thorough and even mixing.

One purpose of this mixer or stirrer is to prevent as far as possiblethe horizontal flow liquid.

of the mass and to produce a pronounced vertical flow.

By the action of the inclined blades rothus all the different particlesare continu-' ally changing their relative positions and areconstantlybeing turned over and over, becoming a a: perfectlyhomogeneous mass. By this means the solids are effectively dissolved,and moreover, prevented from set-- tling on the bottom of the tank,which is not the case where the agitation simply produces a horizontalmotion or swirling effect of the The blades should not, be long enoughto prevent the formation of an up- Wardly directed current of the massbetween the blade end and the tank wall.

The baflie boards at the top of the mass and in combination with thedownward pull I exerted by the blades at the center of the mass, tend tostill further break up any pronouncedrotary motion of the liquid as awhole, and create" furthermore a separate downward current at the centerof the tank for each compartment formed by the baffle boards. Theefficiency of the baffle boards in this respect appears to be due to thefact that they are extended from the wall of the tank to the centerthereof, thus forming in fact a battle board extendin throu hout thetank at or near it surface, and assist in augmenting the vertical flowof the liquid near the center of the tank and about shaft 3.

I By increasing the speed of the rotor, violent agitation is obtained.and by proper regulation of speed a thorough agitation of almostcombination of ingredients can be had.

While I have described one embodiment of my:;invention it will beobvious that the sameis not limited in all detailed respects to theconstruction illustrated.

Claims:

l 1. In a rotor, a shaft, aplurality of padidles of varying lengthlocked thereto in substantially the same horizontal plane, the longpaddles having shanks extended through the same, and a plurality ofshort paddles wedged between the long paddles and thereto.

l. In a stirrer, a rotor comprising a shaft, a plurality of long paddlessecured thereto and a plurality of short paddles wedged between the longpaddles and against the shaft."

5. In a stirrer, a rotor comprising a shaft,

a plurality of two blade paddles secured v I thereto and a plurality ofone blade paddles secured between the two blades paddles.

6. In a rotor, a shaft, a plurality of paddles having shanks withuniform side faces and a plurality of paddles having shanks withnon-uniform side faces engaging the former shanks.

7. A stirrer comprising a tank, and a rotor comprising a shaft, aplurality of paddles secured to the same, and a plurality of baffleboards in and extended across the diameter of the tank and above thepaddles.

8. In a stirrer, a rotor comprising a shaft, a plurality of long paddlessecured to the same, a plurality of short paddles wedged between thelong paddles, and wedge members locking them therein.

9. In a stirrer, a rotor comprising a shaft,

a plurality of paddles, a locking shoulder on each paddle shank, and'awedge for locking the shanks together and to the rotor.

10. In a stirrer, a rotor comprising a shaft, a plurality of paddleshaving one shank face bevelled in one plane, and the op posito shankface bevelled in a plurality of planes.

11. In a stirrer, the tank 1, havingbafile boards lextended the fulldiameter thereof, the shaft having thetwo blade paddles 7, and thesingle plade paddles 8 thereon, and the wedges 17, 18, for locking thepaddle to each other and to the shaft.

In testimony whereof, I have signed my name to this specification.

WARREN o. oral-ice.

